Eldritch Adept
General Feat
Prerequisite: Level 4+, Spellcasting or Pact Magic Feature
Ability Score: Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.
Studying occult lore, you learn one Eldritch Invocation option of your choice from the warlock class. The spells' spellcasting ability is the ability increased by this feat. If the invocation has a prerequisite of any kind, you can choose that invocation only if you're a warlock who meets the prerequisite.
Whenever you gain a level, you can replace the invocation with another one from the warlock class.